AutoCodes – Generic – B1D02

B1D02 Code - Left High Beam Circuit Short

Quick Answer

The Steering Column Control Module (SCCM) monitors input from the multifunction and headlamp switches. Common causes include Faulty Left High Beam Bulb, Left High Beam Bulb harness is open or shorted, Left High Beam Bulb circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1D02 indicates Left High Beam Circuit Short.
Common causes: Common causes include Faulty Left High Beam Bulb, Left High Beam Bulb harness is open or shorted, Left High Beam Bulb circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 7,806

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 26, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1D02 Description

The Steering Column Control Module (SCCM) monitors input from the multifunction and headlamp switches. When the headlamp switch is in the HEADLAMPS ON position and the multifunction switch is placed in the HIGH BEAM position, the SCCM sends a message to the Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN), indicating a high beam request. The BCM then provides voltage to the high beams. The BCM provides an overload protection of the high beam output circuits. When an excessive current draw is detected, the BCM disables the affected high beam circuit driver. The Instrument Panel Cluster (IPC) also receives a message over the HS-CAN to illuminate the high beam indicator when a request for the high beams is received. This Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground or open from the LH high beam output circuit.

OBDII Code B1D02 - Left High Beam Circuit Short - AutoCodes.com — B1D02 Code - Left High Beam Circuit Short

What does this mean?

What are the Possible Causes of the DTC B1D02?

Faulty Left High Beam Bulb
Left High Beam Bulb harness is open or shorted
Left High Beam Bulb circuit poor electrical connection
Faulty Steering Column Control Module (SCCM)

How to Fix the DTC B1D02?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

B1D02:11 Left High Beam Circuit Short To Ground
B1D02:15 Left High Beam Circuit Short To Battery or Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1D02 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1D02 code?

Need more information on how to fix the B1D02 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1D02 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1D02 Ford — Left High Beam Circuit Short
B1D02 Lincoln — Left High Beam Circuit Short
B1D02 Mercury — Left High Beam Circuit Short

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1D02 Code

1. What are the common symptoms of OBDII code B1D02, Left High Beam Circuit Short?

- The common symptoms include the left high beam not working, flickering high beams, or the high beam indicator on the dashboard staying illuminated.

2. What are the possible causes of OBDII code B1D02, Left High Beam Circuit Short?

- The code B1D02 can be triggered by a short circuit in the wiring harness, a faulty high beam bulb, a malfunctioning headlight control module, or a problem with the high beam switch.

3. How can I diagnose OBDII code B1D02, Left High Beam Circuit Short?

- Diagnosing this code involves visually inspecting the wiring harness for any visible damage, testing the high beam bulb for continuity, checking the headlight control module for proper operation, and testing the high beam switch for functionality.

4. What should I do if I encounter OBDII code B1D02, Left High Beam Circuit Short?

- If you encounter this code, it is recommended to address the issue promptly to ensure proper functioning of the high beam. Begin by inspecting the wiring and components mentioned above to pinpoint the root cause of the short circuit.

5. Can I continue driving with OBDII code B1D02, Left High Beam Circuit Short?

- It is not advisable to continue driving with this code active, as it can compromise your visibility at night or in low-light conditions. Addressing the underlying issue promptly is recommended for safety reasons.

6. How can I repair OBDII code B1D02, Left High Beam Circuit Short?

- Repairing this code may involve repairing or replacing the damaged wiring harness, replacing the faulty high beam bulb, repairing or replacing the headlight control module, or addressing any issues with the high beam switch.

7. Can I reset OBDII code B1D02, Left High Beam Circuit Short by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is essential to address the underlying issue causing the short circuit to prevent the code from reoccurring.

8. Is it possible for moisture or water ingress to cause OBDII code B1D02, Left High Beam Circuit Short?

- Yes, moisture or water ingress can potentially cause a short circuit in the left high beam circuit, leading to the triggering of OBDII code B1D02. Inspecting for and addressing any water-related damage is recommended.

9. Does OBDII code B1D02, Left High Beam Circuit Short affect other vehicle systems?

- While this code specifically relates to the left high beam circuit, it is crucial to address the issue promptly to prevent any potential impact on other electrical systems in the vehicle.

10. Can a DIY enthusiast repair OBDII code B1D02, Left High Beam Circuit Short, or is professional assistance recommended?

- Depending on your skill level and experience with automotive electrical systems, you may be able to address this code as a DIY project. However, if you are unsure about diagnosing or repairing the issue, seeking professional assistance is advisable to ensure the problem is resolved correctly.